Bostanaï's descendants in the Exilarchate arbitrarily deposed the presidents of the colleges, and appointed their own partisans to the vacant places. The religious leaders of the people thus bore Bostanaï's descendants a grudge. Even in later times, an authority amongst the Jews had to defend himself with the words: "I am a member of the house of the Exilarch, but not a descendant of the sons of Bostanaï, who were proud and oppressive." The vehement quarrels about the Caliphate, between the house of Ali and the Ommiyyades, were repeated on a small scale in Jewish Babylonia. The half-century from Bostonaï and the rise of the Gaonate till the Exilarchate of Chasdaï (670 to 730) is in consequence involved in obscurity. Few also of the Geonim who held office and of the presidents of the colleges during this period are known, and their chronological order cannot be ascertained. After Mar-Isaac, probably the first Gaon of Sora, Hunaï held office, contemporaneously with Mar-Raba in Pumbeditha (670 to 680). These presidents issued an important decree with respect to the law of divorce, whereby a Talmudical law was set aside. According to the Talmud, the wife can seek a divorce only in very rare cases, _e. g._, if the husband suffers from an incurable disease. Even if the wife were seized with an unconquerable aversion to her husband, she could be compelled by law to live with him, and to fulfil her duties, on penalty of losing her marriage settlement, and even her dowry, in case she insisted upon the separation. Through the domination of Islam circumstances were now changed. The Koran had somewhat raised the position of women, and empowered the wife to sue for a divorce. This led many unhappy wives to appeal to the Mahometan courts, and they compelled their husbands to give them a divorce without the aforesaid penalties. It was in consequence of the events just related that Hunaï and Mar-Raba introduced a complete reform of the divorce laws. They entirely abrogated the Talmudical law, and empowered the wife to sue for a divorce without suffering any loss of her property-rights. Thus the law established equality between husband and wife. For the space of forty years (680 to 720), only the names of the Geonim and Exilarchs are known to us; historical details, however, are entirely wanting. During this time, as a result of quarrels and concessions, there arose peculiar relations of the officials of the Jewish-Persian kingdom towards one another, which developed into a kind of constitution.